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38 lines
1.3 KiB
Racket
38 lines
1.3 KiB
Racket
#lang br
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(require brag/support
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syntax-color/racket-lexer)
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(define in-racket-expr? #f)
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(define/contract (color-jsonic port)
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(input-port? . -> .
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(values (or/c string? eof-object?)
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symbol?
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(or/c symbol? #f)
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(or/c exact-positive-integer? #f)
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(or/c exact-positive-integer? #f)))
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(define jsonic-lexer
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(lexer
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[(eof) (values lexeme 'eof #f #f #f)]
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["@$" (begin
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(set! in-racket-expr? #t)
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(values lexeme 'parenthesis '|(|
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(pos lexeme-start) (pos lexeme-end)))]
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["$@" (begin
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(set! in-racket-expr? #f)
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(values lexeme 'parenthesis '|)|
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(pos lexeme-start) (pos lexeme-end)))]
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[(from/to "//" "\n")
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(values lexeme 'comment #f (pos lexeme-start) (pos lexeme-end))]
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[any-char
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(values lexeme 'string #f (pos lexeme-start) (pos lexeme-end))]))
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(if (and in-racket-expr?
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(not (equal? (peek-string 2 0 port) "$@")))
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(racket-lexer port)
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(jsonic-lexer port)))
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(provide color-jsonic)
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(module+ test
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(require rackunit)
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(check-equal? (values->list (color-jsonic (open-input-string "x")))
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(list "x" 'string #f 1 2))) |